Polishing compound and carrier therefor



' March 13, 1951 I J. LUPO POLI SHING COMPOUND AND CARRIER THEREFOR Filed Oct. 28, 1948 INVENTOR. [foyer/i Luna BY Q Patented Mar. 13, 1951 orslcs POLISHING COMPOUND AND CARRIER THEREFOR Joseph Lupo, Mount Vernon, N. Y.

Application October 28, 1948, Serial No. 57,119

This invention relates to the finishing of articles to remove the rough exterior thereof by tumbling the same with an abrasive or polishing carrier. 4

In this art it has been the practice to employ sawdust or granular fibrous carriers of irregular shape having angulated faces to which carriers an abrasive or polishing compound is applied and the same tumbled with the articles to be finished. In the tumbling operation to finish the surface of the articles the abrasive or polishing compound soon pulverizes the sawdust and wears away the sharp edges and corners of the irregular shaped carrier as well as the rough surfaces of the articles. the carrier produces a fine powder or dust which is emitted from the tumbling apparatus in a dense cloud when the cover of the apparatus is opened to remove or inspect the articles being tumbled. The dust laden air soon fills the room in which the operation is being. carried out so as to recrevices or openings in the articles which is one of the objections to carriers of irregular formation and which also eliminates pitting of the articles. 7

Still another object of the invention is to provide an abrasive or polishing compound of pasty consistency which adheres to the surface of the carrier and retains the abrasive material in a' moistened condition in the mixture so as to prevent the same from disintegrating and forming into a powder or dust.

In the drawings:

Fig. I illustrates a view in elevation grealy enlarged of a fibrous carrier employed in the polishing compound.

In carrying out the invention use is made of a 'fibrous carrier H) such as wooden pellets, corn cob granules and the like which are of generally rounded formation and formed with one or more projections H on one side thereof, the rounded portionof the carrier functioning when coated with the'abrasive and polishing compound to produce an abrasive and polishing action on the plane and outer surfaces of the parts being tumbled while the projections produce an abrasive and polishing action on creviced and re- This wearing away of 1 Claim. (01. 511s4.5)

, 2 cessed surfaces and, the like. The carrier being of generally rounded formation possesses a distinct advantage since the same does not wear away or disintegrate and form obnoxious dust which results when employing sawdust, wooden pegs, chips and the like having sharp angular edges which readily wear away. The carrieris coated with the compound for abrading and polishing the articles when tumbled with the carrier in the usual tumbling barrel and due to the generally rounded formation of the carrier any desired thickness of coating of the abrasive and polishing compound may be applied thereto. This is accomplished by tumbling the carrier with the compound which includes a vehicle for bonding the abrasive material to the outer surface of the carrier and which maintains the articles being tumbled in a moistened and lubricated condition during the cutting down, abrading and polishing thereof. 4

The finishing of the articles is preferably carriedout in three operations consisting of a cuttingdown operation to remove tool marks and rough outer surfaces of the articles, a burnishing operation to provide a smooth surface thereon, and a polishing operation to impart a high luster to the articles. In the cutting down operation a relatively large proportion of coarse abrasive is employed together with a finer abrasive and the proportion thereof to the adhesive and lubricating vehicle in the paste is greater in the cutting down operation than in the burnishing and polishing operations. The adhesive and lubricating vehicle in the abrasive compound for the cutting down operation may consist of tallow, lanolin, glycerin, petrolatum, kerosene and oleic acid and the proportion of the abrasive to the adhesive and lubricating vehicle is approximately 42 parts of the abrasive to approximately 58 parts of the adhesive and lubricating vehicle. It has been found that the following ingredients produce satisfactory results for cutting down or removing the rough exterior on metal articles produced in the manufacture thereof:

Cutting down operation Per cent Lanoliri 24 Glycerin 8 Kerosene 14 Oleic acid 12 Coarse mesh abrasive grit 25 Medium mesh abrasive-240 grit 9 Fine mesh abrasive-$20 grit 8 After the articles have been treated to remove the rough exterior in the cutting down operation they may be treated by an abrasive mixture con- 3 taining the following ingredients in the proportions listed:

Smoothening operation Per cent Tallow or lanolin 29 Glycerin 13 Oleic acid 12 Stearic acid Tripoli or other abrasive320 to 400 mesh 12 Chalk, aluminum oxide or other fine polishing powder-A20 to 600 mesh 24 After the articles have been burnished to provide a smooth face or surface, the same may be treated to impart a high luster to plastic articles and to protect the surface of metallic articles by utilizing a mixture consisting of the following A relatively small amount of the paste consisting of the aforesaid ingredients is required in the operation for imparting a high luster to plastic articles. A teaspoonful of the aforesaid quantity may be applied to approximately 600,000 of the fibrous carrier. Metallic articles burnished with the aforesaid mixture produces a high polish thereon and applies a thin film of the wax vehicle to the surface thereof which covers and seals the surface and prevents oxidation of the metal.

What is claimed is:

In a polishing compound for processing articles, a fibrous carrier of generally rounded formation having projections extending outwardly from one portion thereof, and an abrasive bonded to the surface of the carrier by an adhesive and lubricating vehicle including lanolin, glycerin and kerosene of normally solid consistency and which liquefies under the heat generated in the processing of the articles. I

JOSEPH LUPO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,352,598 Hart Sept. 14, 1920 1,750,499 Truax Mar. 11, 1930 1,887,026 Lach Nov. 8, 1932 2,062,671 Lupo Dec. 1, 1936 2,185,262 Lupo Jan. 2, 1940 2,318,578 Balz May 11, 1943 2,440,656 Huntington Apr. 27, 19 18 

